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<?php session_id('öäü'); var_dump(session_start()); var_dump(session_id());
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: session_start(): Session ID is too long or contains illegal characters. Only the A-Z, a-z, 0-9, "-", and "," characters are allowed in /in/Apat1 on line 4 Warning: session_start(): Failed to read session data: files (path: ) in /in/Apat1 on line 4 bool(false) string(0) ""
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: session_start(): The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in /in/Apat1 on line 4 Warning: session_start(): Failed to read session data: files (path: ) in /in/Apat1 on line 4 bool(false) string(0) ""
Output for 7.1.0 - 7.1.20
Warning: session_start(): The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in /in/Apat1 on line 4 Warning: session_start(): Failed to read session data: files (path: ) in /in/Apat1 on line 4 bool(false) string(6) "öäü"
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
Warning: session_start(): The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in /in/Apat1 on line 4 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/Apat1:4) in /in/Apat1 on line 4 bool(true) string(6) "öäü" Warning: Unknown: The session id is too long or contains illegal characters, valid characters are a-z, A-Z, 0-9 and '-,' in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0

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